Year	Percent
1950	12.92603
1955	9.38134
1960	11.4726
1965	11.76525
1970	11.48174
1975	11.48678
1980	9.92221
1985	9.20804
1990	8.16759
1995	7.58322
2000	7.63168
2005	6.7844
2010	6.29838
2015	5.00317
2020	4.92949
2025	4.68363
2030	4.72245
2035	4.85454
2040	4.79809
2045	4.55602
2050	4.36418
2055	4.34037
2060	4.44647
2065	4.59281
2070	4.66711
2075	4.62766
2080	4.55601
2085	4.54804
2090	4.62329
2095	4.72575
2100	4.78032